Fig. 1. Recording and reconstruction of digital particle hologram

Fig. 2. Schematic of experimental setup for burning particle measurement via high-speed digital holography

Fig. 3. Processing of typical hologram of bamboo powder. (a)Hologram; (b1) reconstructed image of magnified region at z=-2.5 mm; (b2) reconstructed image of magnified region at z=3.2 mm; (b3) depth-of-field extended image; (c) depth-of-field extended image of full hologram; (d) recognized 3D distributed particles. Scale bar represents 1 mm

Fig. 4. Particle morphology and its evolution. (a) Various particle morphologies; (b) morphology evolution in particle fragmentation

Fig. 5. Particle size distributions before and after combustion

Fig. 6. 3D trajectory of single particle. (a) Synthesized image from multi-frame reconstruction; (b) extracted particle and its z locations. Time interval between sequential images is 1 ms

Fig. 7. Radial speed distribution

Fig. 8. Axial speed distribution

Table 1. Properties of air-dried bamboo powder